HELP! Facing a root Canal

AS my horrible luck would have it, i was knocked in the mouth 4 wees ago. Now it looks like the the tooth might need a root canal. I am beyond petrified, that my TN is going to flare up and be horrible. I am not stablize yet with the TN, so this makes the problem worse. Please if anyone has help out there with some good advice please share it with me.